However, Scotch thistle, and other biennials, does have some capacity to regrow if it is injured, like perennial weeds, by forming multi-rosettes from buds located at the base of each leaf. Scotch ...

Winged thistle is a winter annual, which means it generally establishes from seed in autumn, grows as a typical thistle rosette over winter ... clopyralid or triclopyr/picloram. Scotch thistle is the ...